Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Open Start Menu, search for task schedule, run as admin.
When it opens on the right pane, Enable All Task History (if not already). Exit scheduler.
Now when some task runs it will show in Task Status in the middle pane.
When your monitor goes to sleep, come back here and see if you can spot any particular task has run.

I have also seen a case where one of the motherboard applications was causing this regardless of power options. Do you have any such application installed?

One final note: If Task Scheduler history won't work, you can check Event Viewer (Applications and Services Logs - Microsoft - Windows - TaskScheduler - Operational. These load a bit slow, so be patient.

Open Start Menu, search for task schedule, run as admin.
When it opens on the right pane, Enable All Task History (if not already). Exit scheduler.
Now when some task runs it will show in Task Status in the middle pane.
When your monitor goes to sleep, come back here and see if you can spot any particular task has run.

I have also seen a case where one of the motherboard applications was causing this regardless of power options. Do you have any such application installed?

One final note: If Task Scheduler history won't work, you can check Event Viewer (Applications and Services Logs - Microsoft - Windows - TaskScheduler - Operational. These load a bit slow, so be patient.

I enabled the all task history so I guess you are thinking that when I monitors go to sleep there will be a task that shows up in the history.

As far as the motherboard applications I have none running. This is very strange.

Having a issue where my monitors are going to sleep

Dual Monitors reset when S.Saver/sleep/reboot/hibernateDual Monitors reset when Screensaver/sleep/reboot/hibernate
&
Returning to single monitor cause a hissy fit tantrum by win 7
I have a problem with Win7 and my dual monitors setup. I have 2 SyncMaster 245T monitors, connected via DVI cable to a NVIDIA GeForce 7900 GTX card. I have downloaded...

General Discussion

How Make Monitors Sleep When Inactive??How do I make my monitors go to sleep after a period of inactivity?
They used to go to sleep, but I turned that off for a specific reason. Now I can't remember how I did it, and now I can't find where to restore the sleep functionality.
I used to use integrated graphics and now I...

Performance & Maintenance

No Wake From Sleep – BlockedI have an issue with the sleep function. TI have an issue with the sleep function. The computer does not awake from sleep. When I try to do it, it behaves as if it was waking, but it never ends and there is only a black screen; the mouse and keyboard are inoperative. The only thing possible to do is a hard reboot. When it boots, it shows a...

BSOD Help and Support

Apps on Dual monitors swapped around when waking up from sleep modeHi,
I know this is not really a crash, but wasn't sure where else to put it.
I have now been running Windows 7 for about 2 months and am loving it. However, there is one small issue that is starting to drive me NUTS!
Every now and again, after recovering from sleep mode, the apps on my...

General Discussion

MOnitors go into sleep mode and won't come back up,Wasn't really sure where to post this but maybe someone can help me with this very annoying problem I've been having recently.. OK once my monitors go into sleep/hibernation mode they stay black no matter what i do i have to restart the pc to fix the problem also all the lights on my keyboard go...

General Discussion

monitors no wakey from sleep modesometimes not all the time after my pc has been in sleep mode
the monitors dont come back on, i can see the pc wakes up but the monitors stay black and so far the only way ive got it to work is to power off and reboot.
all my drivers are upto date what could be causing this i dont realy want to...